/* ==========================================================================
   Visitenkarten-Stylesheet - Knees Engineering GmbH
   Farbkonzept & Typografie für maximale Lesbarkeit, Barrierefreiheit & Klarheit
   ========================================================================== */

@font-face {
    font-family: 'Open Sans';
    src: url('../fonts/Open_Sans/static/OpenSans-Regular.ttf') format('truetype');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

:root {
    /* Basisfarben (Corporate Identity) */
    --primary: #04345C;
    --secondary: #5591C2;
    --third: #D6EDFF;

    /* Schriftfarben / Textfarben */
    --primary-text: #0F172A;     /* Haupttext: Maximaler Kontrast & ermüdungsfreies Lesen */
    --secondary-text: #475569;   /* Sekundärtext: Für dezentere Angaben, Metadaten und Nebentexte */
    --third-text: #FFFFFF;       /* Inverser Kontrasttext: Für dunkle Hintergründe (z.B. auf Primary) */
    --thrid-text: var(--third-text); /* Unterstützung alternativer Schreibweise */

    /* Abgeleitete funktionale Farben */
    --bg-page: #F8FAFC;
    --bg-card: #FFFFFF;
    --border-color: #E2E8F0;
    --focus-ring: rgba(85, 145, 194, 0.4);

    /* Abstände und Radien */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(4, 52, 92, 0.08), 0 2px 4px -2px rgba(4, 52, 92, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(4, 52, 92, 0.1), 0 4px 6px -4px rgba(4, 52, 92, 0.05);
}

/* --------------------------------------------------------------------------
   Basis-Reset & Typografie
   -------------------------------------------------------------------------- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Open Sans', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.65;
    color: var(--primary-text);
    background-color: var(--bg-page);
    min-height: 100vh;
    padding: 2.5rem 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* --------------------------------------------------------------------------
   Layout-Container
   -------------------------------------------------------------------------- */
.container,
body > * {
    width: 100%;
    max-width: 800px;
}

/* --------------------------------------------------------------------------
   Visitenkarten-Header / Hero-Bereich
   -------------------------------------------------------------------------- */
body > p:first-of-type {
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: 0.5rem;
}

h1 {
    font-size: clamp(1.85rem, 4vw, 2.75rem);
    font-weight: 800;
    line-height: 1.2;
    color: var(--primary);
    margin-bottom: 2rem;
    letter-spacing: -0.02em;
}

/* --------------------------------------------------------------------------
   Trennlinien
   -------------------------------------------------------------------------- */
hr {
    border: 0;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--border-color), transparent);
    margin: 2.5rem 0;
    width: 100%;
}

/* --------------------------------------------------------------------------
   Sektionen (Impressum, Datenschutz)
   -------------------------------------------------------------------------- */
section {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 2rem 2.25rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

section:hover {
    border-color: var(--third);
    box-shadow: var(--shadow-md);
}

h2 {
    font-size: 1.5rem;
    color: var(--primary);
    font-weight: 700;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--third);
    display: inline-block;
}

h3 {
    font-size: 1.05rem;
    color: var(--primary);
    font-weight: 600;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

section > h3:first-of-type {
    margin-top: 0;
}

p {
    color: var(--primary-text);
    margin-bottom: 1rem;
    font-size: 0.975rem;
}

strong {
    color: var(--primary);
    font-weight: 600;
}

ul {
    margin: 0.75rem 0 1.25rem 1.5rem;
    color: var(--primary-text);
}

li {
    margin-bottom: 0.4rem;
    font-size: 0.95rem;
}

li strong {
    color: var(--primary);
}

/* --------------------------------------------------------------------------
   Interaktive Elemente & Links
   -------------------------------------------------------------------------- */
a {
    color: var(--secondary);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
    transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

a:hover,
a:focus-visible {
    color: var(--primary);
    text-decoration-thickness: 2px;
}

a:focus-visible {
    outline: 2px solid var(--secondary);
    outline-offset: 2px;
    border-radius: 2px;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
footer {
    text-align: center;
    padding: 1.5rem 0;
    font-size: 0.875rem;
    color: var(--secondary-text);
}

footer p {
    color: var(--secondary-text);
}

/* --------------------------------------------------------------------------
   Hilfs- & Utility-Klassen
   -------------------------------------------------------------------------- */
.bg-primary { background-color: var(--primary); color: var(--third-text); }
.bg-secondary { background-color: var(--secondary); color: var(--third-text); }
.bg-third { background-color: var(--third); color: var(--primary-text); }

.text-primary { color: var(--primary); }
.text-secondary { color: var(--secondary); }
.text-third { color: var(--third); }

.text-primary-var { color: var(--primary-text); }
.text-secondary-var { color: var(--secondary-text); }
.text-third-var { color: var(--third-text); }

/* --------------------------------------------------------------------------
   Mobile Optimierung
   -------------------------------------------------------------------------- */
@media (max-width: 640px) {
    body {
        padding: 1.5rem 1rem;
    }

    section {
        padding: 1.25rem 1.25rem;
    }

    h1 {
        margin-bottom: 1.25rem;
    }
}